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Avalanche Advisory

Turnagain Area Avalanche Advisory
Thursday, December 1st 2011 9:14 am by Kevin Wright
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
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BROUGHT TO YOU BY
The Bottom Line
Good morning. This is Kevin Wright with the Chugach National Forest Avalanche Information Center on Wednesday, November 30th at 7am. This will serve as a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

There will not be an advisory issued tomorrow. Our next advisory will be issued Friday, December 2nd, at 7am.

BOTTOM LINE
The avalanche danger has increased overnight. Expect to find pockets of CONSIDERABLE avalanche hazard where new snow and strong wind have built windslabs that are likely to be triggered by people today. There were 3 changes that make this storm different than anything weve had in the last 3 weeks storm intensity, high wind with the snowfall, and dramatically increasing temperatures. Even before this snowfall we were finding potentially dangerous windslabs. All these problems have become worse overnight.

AVALANCHE DISCUSSION
Todays avalanche discussion is mostly about the weather. We got variable snow amounts, from 2-10 inches through the region. The strongest pulse came in late last night, with a short intense period around 10pm. Wind also spiked around the same time with ridge-top gusts reaching up to 72mph. Wind direction was generally East to Southeast, blowing snow onto the West and Northwest slopes. Temperatures increased significantly but stayed cold enough during the snowfall to remain snow. The most dramatic increase was around Portage where the temperature rose 40 degrees in 8 hours (total increase in 24 hours was 48 degrees!).

Increased snow, wind, and temperature all produce higher avalanche danger. Also remember that we had some avalanche issues before this storm, which compounds the issue. The new snow is being added to a discontinuous windslab that formed on Sunday. This sits on top of relatively weak faceted snow from the cold snap.

Backcountry travel is possible today, but requires well tuned routefinding skills to stay in safe areas. This is a good day to avoid upper elevation areas, especially on the North and West sides of the mountains.


MOUNTAIN WEATHER
Snowfall is expected to continue lightly over the next several days. It looks like the bulk of this storm just skimmed us before trending farther East into Prince William Sound. The general flow pattern will remain similar for the foreseeable future, with warmer temperatures and precipitation possible every day through the week. Wind will be moderate along with the snowfall.

CNFAIC Weather Page and the NWS forecast

I will issue the next advisory Friday morning at 7am. If you get out in the backcountry we want to know what you are seeing. Please send us your observations using the button at the top of this page or give us a call at 754-2369. Thanks and have a great day.

 Show the Complete North American Avalanche Danger Scale
0 NO RATING Alpine / Above 2,500'
0 NO RATING Treeline / 1,000'-2,500'
0 NO RATING Below Treeline / Below 1,000'

This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

Winter snowmachine use open/closed status and riding conditions updates

Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.

(Updated: May 06, 2018 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: ClosedClosed as of April 20th
Placer River: ClosedClosed as of April 17th
Skookum Drainage: ClosedClosed as of April 1st.
Turnagain Pass: ClosedClosed as of May 7th. Happy summer, see ya when the snow flies!
Twentymile: ClosedClosed as of April 13th
Seward District
Carter Lake: ClosedClosed as of 4/27
Lost Lake Trail: ClosedClosed as of April 13th
Primrose Trail: ClosedClosed as of April 13th
Resurrection Pass Trail: ClosedClosed as of April 20th
Snug Harbor: ClosedClosed as of 4/27
South Fork Snow River Corridor: ClosedClosed as of April 13th
Summit Lake: ClosedClosed as of April 20th

Subscribe to the Turnagain Area Avalanche Advisory:

The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur. This advisory provided by the Chugach National Forest, in partnership with Friends of the Chugach National Forest Avalanche Information Center.


USFS SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
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